JPH0773416B2 - Electric motor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor in which a wedge is inserted in a slot in order to prevent a conductor wire wound in the slot from jumping out of the slot.

2. Description of the Related Art A conventional electric motor of this type will be described below.

6 (a) and 6 (b) show a plan view and a perspective view of the rotor of the electric motor (however, in FIG. 6 (b), the conductor wire and the wedge are not shown), and 1 in the drawing is This is an inner core formed by stacking a plurality of core sheets formed by punching out electromagnetic steel sheets, and a slot 2 is formed on the outer periphery of the inner core, and a conductor wire 3 is wound in the slot 2. . Four
Is a wedge that prevents the conductor in the slot from jumping out of the slot opening 2a and is made of an insulating material. Like the inner core 1, an outer core 5 made of an electromagnetic steel plate is press-fitted to the outer periphery of the inner core 1. The wedge 4 is generally formed by bending a rectangular plate at both ends as shown in FIG. 7 or by forming a substantially rectangular shape as shown in FIG.

Problems to be Solved by the Invention By the way, when the core 6 having a skew as shown in FIG. 9 is used, the wedge must be twisted when inserting. However, in the case of the shape shown in FIG. 7, both sides of the wedge are bent in the entire longitudinal direction, so that there is a problem that twisting is difficult and workability is extremely poor. In addition, a wedge having a shape as shown in FIG. 8 can be easily inserted into the slot, but does not have a shape for holding the conductor wire 3 unlike the wedge shown in FIG. There is a problem that the wedge is easily removed.

Further, in the case of using the core shown in FIG. 9 in which the skew is formed, the problem that the wedge is easily disengaged becomes more remarkable.

Therefore, it is an object of the present invention to provide an electric motor that employs a wedge in which the wedge can be easily inserted into the slot even if the core is skewed and the wedge does not come off from the slot opening.

Means for Solving the Problems In order to solve the problems, the electric motor of the present invention is a core provided with a slot formed of a magnetic material and having a skew, and a conductor wire wound in the slot, The wedge includes a wedge arranged between the opening of the slot and the conductor, and the wedge has the ears standing upright toward the conductor on the left and right in the vicinity of both ends of the flat plate-like member. The edge is characterized by a receding angle in the insertion direction.

Operation Since the wedge to be inserted into the slot is easily twisted by the above configuration, even if the slot is skewed, the wedge can be easily inserted while twisting.
Since the ears are formed on the left and right of both ends of the wedge and the ears hold the conductor, the problem that the wedge comes off from the slot opening can be solved. In addition, by providing the receding angle, smooth insertion can be performed.

Example An electric motor according to an example of the present invention will be described below with reference to the accompanying drawings.

The plan view and the perspective view of the rotor used in the electric motor according to the embodiment of the present invention are the same as those shown in FIGS. 6 (a) and 6 (b) used in the description of the conventional example, and therefore the description thereof will be omitted.

The characteristic part of the electric motor of this embodiment is the shape of the wedge 10, as shown in FIG.

In other words, the wedge 10 according to the present embodiment has left and right ear portions near the one end 11a of the flat plate member 11 and near the other end 11b.
By extending 12a and 12b, a narrow portion 11c is formed between the end portions 11a and 11b.

The ears 12a and 12b are bent in the same direction. A side view of the wedge with the ears bent is as shown in FIG. As can be seen in this figure, the ear 12
The front edge 12a 'of a is formed so that the angle θ with the flat plate member 11 is an acute angle, that is, a receding angle.

The wedge 10 formed as described above is inserted from the end 11a into the slot formed in the core. By the way, since the wedge used in this embodiment has the narrow portion 11c,
This wedge can be easily twisted as shown in FIG. Further, by providing the receding angle, it is possible to smoothly insert the conductive wire 3 without catching it.

Here, as shown in FIG. 9, a skew is formed in the core 6, but in the wedge 10, the narrow portion 11c is twisted and inserted, and the wedge 10 can be easily inserted according to the direction of the slot. It is possible. Further, since the ears 12a, 12b are configured to embrace the conductor 3, the wedge does not easily come off from the slot opening.

4 (a), (b), and (c) show a side view of the core in a state where wedge insertion is completed, a lateral cross-sectional view of the waist, and an enlarged side view of essential parts. As can be seen in the figure, when the wedge 10 is completely inserted, about half of the wedge end portions 11a and 11b project from the end surface portion 6a of the core, and this projecting portion is a substantially U-shape with the ear portion 12a formed. Because of the shape, the insulation distance x between the conductor and the end surface portion 6a of the core can be sufficiently secured as shown in FIG. 4 (b).

In addition to the wedge having the above-described shape, various modifications such as the shape shown in FIG. 5 can be considered.

EFFECTS OF THE INVENTION As is apparent from the above description, the electric motor of the present invention includes a core formed of a magnetic material and having a skew formed therein, a conductor wire wound in the slot, and a slot. The wedge is provided between the opening and the conductor, and the wedge has the ears standing upright toward the conductor on the left and right in the vicinity of both ends of the flat plate-shaped member. Since the edge has a receding angle in the insertion direction, the wedge can be smoothly inserted into the slot even if a skew is formed, and the mounting state is stable, and the wedge is removed from the slot opening. There is no chance that it will end up.

[Brief description of drawings]

FIG. 1 is a perspective view of a wedge used in an electric motor according to an embodiment of the present invention, FIG. 2 is a side view of the wedge, FIG. 3 is a perspective view showing the wedge in a twisted state, and FIGS. b),
(C) is a side view of the rotor in a state where the wedge is completely inserted, a lateral cross-sectional view of an essential part, an enlarged side view of the essential part, FIG. 5 is a perspective view of a wedge according to another embodiment, and FIG. ), (B)
Is a plan view and a perspective view of a core of an electric motor, FIGS. 7 and 8 are perspective views of a wedge used in a conventional electric motor, and FIG. 9 is a perspective view of a core in which a skew is formed. 1 ... Inner core, 2 ... Slot, 3 ... Conductor wire, 4 ... Wedge, 5 ... Outer core, 6 ... Core, 11 ... Flat plate member, 11a, 11b ... End part, 11c ... Narrow part, 12a, 12b ... Ear

Claims (1)

[Claims] 1. A core having a slot formed of a magnetic material and having a skew, a conductor wire wound in the slot, and arranged between an opening of the slot and the conductor wire. The wedge includes a wedge, the ears are respectively erected on the left and right in the vicinity of both ends of the flat plate member toward the side of the conductive wire, and the ears have a receding angle in the insertion direction at the front edge portion in the insertion direction. An electric motor characterized by being provided.